Distance beSveen A and Β is 29.490 mm. The Type 1222 makes it possible to measure several times faster down to five microns. Shown: Diffraction pattern for beryllium and molybdenum disulfide in Fe crucible.
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Now measure X-ray diffraction spectra with 20 times greater accuracy. With the Mann Type 1222 Photo electric Line Setting Instrument you can measure diffraction line positions more precisely and quickly than ever before—without introducing visual errors. You can also determine film densities with higher accuracy. The Type 1222 is a complete data reduction and recording instrument. It has a film-measuring precision comparator...a photoelectric setting device for accurately positioning the line of interest on the reference axis ...a digital readout for recording the information by typewriter, card punch or tape punch. Line center is found by using the oscilloscope. The density profile of the line is presented on the scope face as the line is scanned first from one side, then the other. The profile traces are therefore mirror images, and center is where the peaks coincide. Photoelectric setting is far more accurate and reproducible than visual methods. Faint lines, previously un usable, can now be measured. Density readings taken from the oscilloscope are manually entered into the memory of the digitizer. The operator presses
a foot switch to record density and position on an output writer or other recorder. If desired, the density read ing can be recorded during a con tinuous power scan. The X-coordinate allows you 380 mm of travel and the Y-coordinate provides 50 mm of cross-motion. There is also a pivot table that per mits motion for precise alignment in X. Maximum error is ± 0.005 mm or .003% of stage travel, giving an accuracy 20 times greater than usual methods of measuring X-ray diffrac tion films. With modifications, the Mann Type 1222 Photoelectric Line Setting Instrument may be used in optical mass spectrography and electron diffraction analysis. For more details on the construction, operation and capabilities of this advanced instrument and recording system, write today for our new Mann Type 1222 brochure. DIVISION OF
DAVID W. MANN COMPANY 182 Middlesex Tpke., Burlington, Mass. 01804, T e l : 617-272-5600
GCA
CORPORATION
Circle No. 11 on Readers' Service Card VOL. 3 8 , N O . 7, JUNE 1 9 6 6
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